CCRL 40/40 - A most curious game

[pichy]

Can you provide a link to download the games please
Don't post them here,they'll rip you off for that
Dr.D

I will send them to anybody who wants them by email. My email is jnspichardo@bis.midco.net

I noticed that opening books with more than 10 moves or (20 half moves) do not perform any better than a short opening book with strong engines, for the reason that these strong engines only need the intial 10 moves which is the opening without going into the middle game territory. At the contrary providing strong engines with long opening moves beyong 10 moves from human GM rated below 2700 can only cause more damage to the engines, since some human GM 2500 through 2660 when they go into the middle game stage play much weaker than the top engines. as you can see the opneing book of HS-10moves.abk which only goes to 10 moves is as strong as Mike HP91-09_2500.abk and considering that Harry book is 3+ years old.

PS: I am pretty sure that if Mike create a short opening with only 8 moves from the same database which he created the HP91-09_2500.abk it will perform better with programs such as Rybka 3, Naum4, shredder 12. On the other hand if the engine is weaker than 2600 SSDF than a long opening book as he created will benefit the engine, since it will take the engine into the middle game stage with moves select from human players rated between 2500- 2600.

[Guenther]

Can you provide a link to download the games please :?:
Don't post them here,they'll rip you off for that :lol:
Dr.D

I will send them to anybody who wants them by email. My email is jnspichardo@bis.midco.net

I noticed that opening books with more than 10 moves or (20 half moves) do not perform any better than a short opening book with strong engines, for the reason that these strong engines only need the intial 10 moves which is the opening without going into the middle game territory. At the contrary providing strong engines with long opening moves beyong 10 moves from human GM rated below 2700 can only cause more damage to the engines, since some human GM 2500 through 2660 when they go into the middle game stage play much weaker than the top engines. as you can see the opneing book of HS-10moves.abk which only goes to 10 moves is as strong as Mike HP91-09_2500.abk and considering that Harry book is 3+ years old.

PS: I am pretty sure that if Mike create a short opening with only 8 moves from the same database which he created the HP91-09_2500.abk it will perform better with programs such as Rybka 3, Naum4, shredder 12. On the other hand if the engine is weaker than 2600 SSDF than a long opening book as he created will benefit the engine, since it will take the engine into the middle game stage with moves select from human players rated between 2500- 2600.

I disagree in several ways. The saved time alone would be decisive
in favour of a huge good book at your time controls.
The longer the time controls of course, the more would the smaller
book get closer to the huge good book, but still stay behind.
A book like RybkaIII/II.ctg would kill a best possible 8 moves whatever book.
You could test it yourself with the Aquarium Book adapter.
BTW we don't even know what this HP91-09_2500.abk is?

Yet I dislike extremely long book lines and I only agree that beyond
a certain depth it is logical that the number of weaker moves in a book
rises up. The scenario you have in mind must be much more precisely
specified, as all good tests too BTW.

Guenther

[Graham Banks]

Yet I dislike extremely long book lines

Amen to that. It's good to see the engines think for themselves, otherwise what's the point?

[Dr.Wael Deeb]

Yet I dislike extremely long book lines

Amen to that. It's good to see the engines think for themselves, otherwise what's the point?

That if we take it for granted that they can think correctly after leaving the opening book

[Norm Pollock]

Another issue in the book vs engine discussion is that an engine will always choose the "best" move it can find based on its time limited evaluation, however a book will not necessarily choose its "best" move. A book determines its best move based on the stats in its underlying database, but because the book also has to show "variety", a move other than the "best" will sometimes be chosen. For example, if a book always chose its best move, most books would always choose "e4" as its first move for White.

[pichy]

Yet I dislike extremely long book lines

Amen to that. It's good to see the engines think for themselves, otherwise what's the point?

That if we take it for granted that they can think correctly after leaving the opening book

Engines like Rybka3, Naum 4, shredder 12, Fritz 12, will definitively do better with short opening books of no more than 10 moves and they currently will chose better continuying moves than most GM rated between 2500-2600 in the middle game. Therefore, a long opening book of more than 10 moves generated from GMs rated between 2500- 2600 will harm those 4 engines more than a short opening book.

[pichy]

Can you provide a link to download the games please
Don't post them here,they'll rip you off for that
Dr.D

I will send them to anybody who wants them by email. My email is jnspichardo@bis.midco.net

I noticed that opening books with more than 10 moves or (20 half moves) do not perform any better than a short opening book with strong engines, for the reason that these strong engines only need the intial 10 moves which is the opening without going into the middle game territory. At the contrary providing strong engines with long opening moves beyong 10 moves from human GM rated below 2700 can only cause more damage to the engines, since some human GM 2500 through 2660 when they go into the middle game stage play much weaker than the top engines. as you can see the opneing book of HS-10moves.abk which only goes to 10 moves is as strong as Mike NP91-09_2500.abk and considering that Harry book is 3+ years old.

PS: I am pretty sure that if Mike create a short opening with only 8 moves from the same database which he created the NP91-09_2500.abk it will perform better with programs such as Rybka 3, Naum4, shredder 12. On the other hand if the engine is weaker than 2600 SSDF than a long opening book as he created will benefit the engine, since it will take the engine into the middle game stage with moves select from human players rated between 2500- 2600.

I disagree in several ways. The saved time alone would be decisive
in favour of a huge good book at your time controls.
The longer the time controls of course, the more would the smaller
book get closer to the huge good book, but still stay behind.
A book like RybkaIII/II.ctg would kill a best possible 8 moves whatever book.
You could test it yourself with the Aquarium Book adapter.
BTW we don't even know what this NP91-09_2500.abk is?

Yet I dislike extremely long book lines and I only agree that beyond
a certain depth it is logical that the number of weaker moves in a book
rises up. The scenario you have in mind must be much more precisely
specified, as all good tests too BTW.

Guenther

The NP91-09_2500.abk is Mike Scheidl latest opening book, and to prove my case I had a little experiment, I chose Rybka 232a to play for both of these openings, one long book by Mike scheidl based on humans GMs rated between over 2500, but not over 2700 and the other by Harry the short book up to 10 moves, even if it is 3+ years old and it is only up to 10 moves Rybka 232a was able to equalize the game.

http://talkchess.com/forum/viewtopic.ph ... 94&t=30270


Engine Score Ry Ry S-B
1: Rybka v2.3.2a.w32-A 50.5/100 ···································································································· 1==1=======0====0=====0=01111=0==01=01==1====000=0=0=0101=0=11=011====11===0=0===11=0010==11101=0=== 2499.7
2: Rybka v2.3.2a.w32-B 49.5/100 0==0=======1====1=====1=10000=1==10=10==0====111=1=1=1010=1=00=100====00===1=1===00=1101==00010=1=== ···································································································· 2499.7

100 games played / Tournament is finished
Name of the tournament: Arena tournament
Site/ Country: Jorge-07E2FB46AF, United States
Level: Tournament Game in 10 Minutes
Hardware: AMD Athlon(TM) XP 2000+ 1662 MHz with 992 MB Memory
Operating system: Microsoft Windows XP Home Edition Service Pack 3 (Build 2600)
PGN-File: C:\Program Files\Arena\Books\arena.pgn
Website:
E-Mail Address:

---------------------------------------------------
Here is the last game:

[Event "Arena tournament"]
[Site "RUTH-07E2FB46AF"]
[Date "2009.10.30"]
[Round "100"]
[White "Rybka v2.3.2a.w32-B"]
[Black "Rybka v2.3.2a.w32-A"]
[Result "1/2-1/2"]
[BlackElo "2900"]
[ECO "A26"]
[Opening "English"]
[Variation "Botvinnik System, 6...Nf6 7.Nf3 O-O 8.O-O"]
[WhiteElo "2900"]
[TimeControl "600"]
[Termination "normal"]
[PlyCount "267"]
[WhiteType "program"]
[BlackType "program"]

1. e4 e5 2. Nf3 Nc6 3. d3 g6 4. Be2 {(Bf1e2 Ng8f6 OO Bf8g7 c2c4 OO Nb1c3
d7d6 Qd1b3 Nf6d7)} Nf6 {(Ng8f6 OO Bf8g7 c2c4 OO Nb1c3 d7d6 h2h3 Bc8e6 Nc3d5
a7a5)} 5. O-O {(OO Bf8g7 c2c4 OO Nb1c3 d7d6 Bc1e3 Bc8e6 Qd1b3 Nf6g4 Be3d2)}
Bg7 {(Bf8g7 c2c4 OO Nb1c3 d7d6 h2h3 a7a6 Bc1e3 Rf8e8 a2a3 Bc8d7)} 6. c4
{(c2c4 OO Nb1c3 d7d6 h2h3 Bc8d7 Bc1g5 a7a5 Qd1b3 h7h6 Bg5e3)} O-O {(OO
Nb1c3 d7d6 Bc1e3 Nf6h5 Be3g5 Bg7f6 h2h4 Bf6xg5 h4xg5 Bc8e6 Nc3d5)} 7. Nc3
{(Nb1c3 d7d6 h2h3 Bc8d7 Bc1g5 a7a5 Qd1b3 h7h6 Bg5e3 b7b6)} d6 {(d7d6 Bc1e3
Nf6h5 Be3g5 Bg7f6 Bg5h6 Bf6g7 Qd1d2 Bc8e6 Bh6g5)} 8. h3 {(h2h3 a7a6 Bc1e3
Bc8d7 Qd1c2 Ra8b8 a2a3 Rf8e8 Rf1d1)} Nd4 {(Nc6d4 Nf3xd4 e5xd4 Nc3d5 Rf8e8
Bc1f4 c7c6 Nd5xf6+ Bg7xf6 Qd1d2 Qd8c7 Be2f3 Bc8d7)} 9. Nxd4 {(Nf3xd4 e5xd4
Nc3d5 Bc8d7 Qd1c2 c7c6 Nd5f4 Rf8e8 Bc1d2 Re8e5)} exd4 {(e5xd4)} 10. Nd5
{(Nc3d5 Nf6d7 Bc1d2 c7c6 Nd5f4 Nd7e5 a2a4 Bc8d7 Qd1b3 Qd8c7)} Re8 {(Rf8e8
Nd5f4 Nf6d7 Bc1d2 Nd7e5 Qd1c2 Bc8d7 a2a4 c7c6 a4a5)} 11. Bd2 {(Bc1d2 Nf6xd5
c4xd5 c7c6 Qd1b3 c6xd5 Qb3xd5 Re8e5 Qd5xd4 Re5b5 Qd4e3)} Nxd5 {(Nf6xd5
c4xd5 c7c6 d5xc6 b7xc6 Ra1c1 Bc8d7 Bd2f4 Ra8b8 Qd1d2 Bg7e5)} 12. cxd5
{(c4xd5 c7c6 d5xc6 b7xc6 Ra1c1 Qd8b6 b2b3 a7a5 Bd2g5 Qb6b5)} c6 {(c7c6
d5xc6 b7xc6 Ra1c1 Bc8d7 Be2g4 Ra8b8 b2b4 Qd8c7 Bg4xd7 Qc7xd7 Qd1g4)} 13.
dxc6 {(d5xc6 b7xc6 Ra1c1 Bc8d7 b2b4 Ra8b8 Be2g4 Rb8b6 Qd1a4 Bd7xg4)} bxc6
{(b7xc6)} 14. Rc1 {(Ra1c1 Bc8d7 b2b4 Ra8b8 Be2g4 Rb8b6 Qd1a4 Bd7xg4 h3xg4
Qd8d7)} c5 {(c6c5 Be2g4 Bc8a6 Bd2f4 Ra8b8 b2b3 Qd8f6 Bf4g3 Bg7h6)} 15. b4
{(b2b4 c5xb4 Bd2xb4 d6d5 Qd1d2 d5xe4 d3xe4 a7a5 Bb4c5 Bc8b7 f2f3 Ra8c8)}
cxb4 {(c5xb4 Bd2xb4 d6d5 e4xd5 Ra8b8 Bb4c5 Qd8xd5 Be2f3 Qd5xa2 Rc1a1
Qa2b3)} 16. Bxb4 {(Bd2xb4 d6d5 Qd1d2 d5xe4 d3xe4 a7a5 Bb4c5 Bc8b7 f2f3
Ra8c8 Rf1d1)} d5 {(d6d5 e4xd5 Ra8b8 Bb4c5 Qd8xd5 Be2f3 Qd5xa2 Rc1a1 Qa2b3
Ra1xa7 Bc8e6)} 17. exd5 {(e4xd5 Ra8b8 Bb4c5 Qd8g5 Be2f3 Bc8xh3 Bc5d6 Rb8b2
Rc1c2 Rb2xc2 Qd1xc2 Bh3d7)} Rb8 {(Ra8b8 Bb4c5 Qd8xd5 Be2f3 Qd5xa2 Rc1a1
Qa2e6 Ra1xa7 Rb8b5 Qd1c2)} 18. Bc5 {(Bb4c5 Qd8g5 Be2f3 Bc8xh3 Bc5d6 Rb8b2
Rc1c2 Rb2xc2 Qd1xc2 Bh3d7 Qc2c5)} Qxd5 {(Qd8xd5 Be2f3 Qd5xa2 Rc1a1 Qa2e6
Ra1xa7 Rb8b5 Qd1c2 Bc8d7 Rf1b1)} 19. Bf3 {(Be2f3 Qd5d7 Qd1d2 Rb8b5 Rf1e1
Re8xe1+ Qd2xe1 Bc8b7 Bf3xb7 Rb5xb7 Qe1e4 f7f5)} Qd7 {(Qd5d7 Rf1e1 Re8xe1+
Qd1xe1 Bc8a6 Qe1d2 Rb8e8 Qd2c2 Ba6b7 Bf3xb7 Qd7xb7 Qc2b3)} 20. Qd2 {(Qd1d2
Bc8a6 Rf1e1 Rb8c8 Re1xe8+ Rc8xe8 Qd2c2 Bg7e5 Qc2b3 Qd7b5 Bf3e4)} Ba6
{(Bc8a6 Rf1e1 Rb8c8 Re1xe8+ Rc8xe8 Bf3e4 Ba6b7 Be4xb7 Qd7xb7 Rc1c4 Qb7d7
Qd2a5 Qd7f5)} 21. Bg4 {(Bf3g4 Qd7b5 Rc1c4 Qb5b2 Rc4c2 Qb2b5 Rf1d1 h7h5
Bg4e2)} Qb5 {(Qd7b5 Rc1c4 Qb5c6 Rc4c2 Qc6b5 Rc2c4 Qb5c6 Rc4c2 Qc6b5 Rc2c4
Qb5c6 Rc4c2 Qc6b5 Rc2c4)} 22. Rc4 {(Rc1c4 Qb5b2 Rc4c2 Qb2b5 Rc2c4 Qb5b2
Rc4c2 Qb2b5 Rc2c4 Qb5b2 Rc4c2 Qb2b5 Rc2c4 Qb5b2)} h5 {(h7h5 Bg4d1 Qb5d7
Bd1a4 Ba6b5 Ba4xb5 Rb8xb5 Bc5b4 Rb5e5 Qd2f4 a7a5)} 23. Bd1 {(Bg4d1 Qb5d7
Bd1a4 Ba6b5 Ba4xb5 Rb8xb5 Rf1c1 Bg7e5 Rc1e1 Rb5b8 Rc4c1)} Qd7 {(Qb5d7 Bd1a4
Ba6b5 Ba4xb5 Rb8xb5 Rf1c1 a7a5 Qd2c2 Rb5b8 Qc2d2)} 24. Ba4 {(Bd1a4 Ba6b5
Ba4xb5 Rb8xb5 Rf1c1 a7a5 Qd2c2 Rb5b8 Qc2d2 Rb8b5 Qd2c2 Rb5b8 Qc2d2 Rb8b5)}
Bb5 {(Ba6b5 Ba4xb5 Rb8xb5 Rf1c1 Bg7e5 Rc1e1 Kg8h7 Bc5b4 Rb5b6 Qd2g5 Be5f6)}
25. Bxb5 {(Ba4xb5 Rb8xb5 Rf1c1 a7a5 Qd2c2 Rb5b8 Qc2d2 Rb8b5 Qd2c2 Rb5b8
Qc2d2 Rb8b5 Qd2c2 Rb5b8)} Rxb5 {(Rb8xb5 Rf1c1 Bg7e5 Rc1e1 Kg8h7 Bc5b4 Rb5b6
f2f3 Rb6e6 Re1c1)} 26. Rfc1 {(Rf1c1 a7a6 Rc4b4 Bg7e5 Rb4c4 Kg8h7 f2f4 Be5g7
Rc4b4)} a6 {(a7a6 Bc5b4 Rb5e5 Qd2f4 a6a5 Bb4d2 Re5e2 Bd2xa5 Bg7e5)} 27. Qc2
{(Qd2c2 Rb5b8 Rc4a4 Re8c8 Ra4c4 Bg7e5 Qc2d2 Rc8e8 f2f4 Be5g7 Bc5b4 Qd7e6
Kg1f2)} Rbb8 {(Rb5b8 Rc4a4 Re8c8 Ra4c4 Bg7e5 Qc2d2 Rc8e8 f2f4 Be5f6 Bc5b4
Re8e3 Qd2c2 Qd7f5)} 28. Rb4 {(Rc4b4 Qd7d5 Rb4c4 Rb8c8 Bc5b4 Rc8xc4 Qc2xc4
Qd5xc4 Rc1xc4 Re8e2 Rc4c8+ Kg8h7)} Rbc8 {(Rb8c8 Rb4c4 Rc8b8 Rc4a4 Re8c8
Ra4c4 Bg7e5 Qc2d2 Rc8e8 f2f4 Be5f6 Bc5b4 Re8e3 Qd2c2)} 29. Rc4 {(Rb4c4
Bg7e5 Bc5b4 Rc8b8 Bb4c5 Kg8g7 Qc2d2 Kg7h7 f2f4 Be5g7)} Be5 {(Bg7e5 Bc5b6
Rc8xc4 Qc2xc4 Re8b8 Bb6c5 Qd7b5 g2g3 Rb8c8 Kg1g2 Qb5b7+ f2f3)} 30. Bb4
{(Bc5b4 Rc8b8 Bb4c5 Kg8g7 Qc2d2 Kg7h7 f2f4 Be5g7 Rc4b4)} Rb8 {(Rc8b8 Bb4c5
Re8e6 Qc2d2 Rb8e8 Qd2b4 Re6c6 Rc1e1 Re8b8)} 31. Bc5 {(Bb4c5 Re8e6 Qc2d2
Rb8e8 Qd2b4 Re6c6 Rc1e1 Re8b8 Qb4d2 Qd7d5)} Re6 {(Re8e6 Qc2d2 Rb8c8 Qd2g5
Rc8e8 Bc5b4 Be5d6 Bb4xd6 Re6e1+ Rc1xe1)} 32. Qd2 {(Qc2d2 Rb8e8 Qd2b4 Re6c6
Rc1e1 Re8b8 Qb4a4 Qd7c7)} Rc8 {(Rb8c8 Qd2g5 Rc8e8 Rc1f1 Re6c6 Rf1c1 Rc6f6
f2f3 Rf6f5)} 33. h4 {(h3h4 Kg8h7 Bc5b4 Re6c6 Rc4xc6 Rc8xc6 g2g3 Qd7d5)}
Rce8 {(Rc8e8 Bc5b4 Qd7b5 Rc4c2 Qb5b7 a2a3 Qb7d7)} 34. Qb4 {(Qd2b4 Re8d8
g2g3 Be5f6 Qb4a5 Re6e2 Rc4c2 Re2xc2)} Rb8 {(Re8b8 Qb4d2 Rb8c8 g2g3 Rc8e8
Qd2b4 Re8b8 Qb4d2 Re6c6 Qd2g5 Qd7d5 Bc5a7 Rc6xc4)} 35. Qd2 {(Qb4d2 Kg8h7
Bc5b4 Rb8e8 g2g3 Qd7b7 Rc1e1 Be5f4 Qd2d1)} Rc8 {(Rb8c8 g2g3 Re6c6 Qd2g5
Be5g7 Qg5d2 Qd7d5 Qd2b4)} 36. g3 {(g2g3 Kg8h7 Bc5b4 Rc8xc4 Rc1xc4 Qd7b7
Qd2d1 Kh7g8 Qd1d2 Re6c6 Qd2c1)} Rec6 {(Re6c6 Qd2g5 Be5g7 Rc1c2 Rc8e8 Qg5d2
Qd7g4 Kg1g2 Qg4f5)} 37. Qg5 {(Qd2g5 Be5f6 Qg5d2 Qd7d5 Qd2b4 Qd5e6 Qb4d2
Qe6g4 Qd2b4 Bf6e5 Qb4d2 Qg4f3 Qd2g5 Be5f6)} Bg7 {(Be5g7 Rc1c2 Rc8e8 Qg5d2
Qd7g4 Kg1g2 Bg7e5 Qd2g5)} 38. Qd2 {(Qg5d2 Qd7d5 Qd2b4 Qd5f3 Bc5a7 Rc6xc4
Rc1xc4 Rc8e8 Ba7xd4 Qf3xd3)} Re8 {(Rc8e8 Qd2f4 Qd7d5 Bc5b4 Rc6xc4 Rc1xc4
Re8e2 Bb4d2 Qd5d7)} 39. a4 {(a2a4 Qd7d5 Qd2b2 Bg7e5 Qb2e2 Re8c8 Bc5b4
Rc6xc4)} Kh7 {(Kg8h7 Qd2d1 a6a5 Rc1b1 Qd7f5 Rb1b5 Rc6e6 Rc4c1)} 40. Rb1
{(Rc1b1 Qd7d5 Rb1c1 Re8c8 Qd2b4 Bg7e5 a4a5)} Qd5 {(Qd7d5 Rb1c1 Rc6e6 Qd2b4
a6a5 Qb4xa5 Re6e2 Rc4c2 Qd5f5 Rc2xe2 Re8xe2 Rc1f1)} 41. Rbc1 {(Rb1c1 Re8c8
Qd2c2 Bg7e5 f2f4 Be5g7 Qc2g2)} Rec8 {(Re8c8 Qd2a5 Bg7h6 Rc1c2 Qd5f3 Qa5e1
Qf3xd3 Qe1e5 Rc6e6)} 42. Qa5 {(Qd2a5 Bg7h6 Rc1c2 Qd5f3 Bc5b4 Qf3d1+ Kg1h2
Rc6xc4 Rc2xc4 Rc8xc4 d3xc4 Qd1e2 Qa5d5 Qe2xf2+)} Bh6 {(Bg7h6 Rc1c2 Qd5f3
Bc5b4 Qf3d1+ Kg1g2 Qd1xd3 Rc4xc6 Rc8xc6 Rc2xc6 Qd3e4+ f2f3 Qe4xc6 Qa5c5)}
43. R1c2 {(Rc1c2 Qd5f3 Bc5d6 Qf3d1+ Kg1g2 Qd1xd3 Rc4xc6 Rc8xc6 Rc2xc6
Qd3e4+ Kg2g1 Qe4xc6 Bd6e5 Qc6c1+)} Qf3 {(Qd5f3 Bc5xd4 Rc6xc4 Rc2xc4 Rc8xc4
d3xc4 Qf3d1+ Kg1g2 Qd1xd4 Qa5xa6 Bh6d2 a4a5 Qd4e4+ Kg2g1)} 44. Bxd4
{(Bc5xd4 Rc6xc4 Rc2xc4 Rc8xc4 d3xc4 Qf3d1+ Kg1g2 Qd1xd4 Qa5xa6 Bh6f8 Qa6b7
Qd4xc4 a4a5 Qc4a2)} Rxc4 {(Rc6xc4 Rc2xc4 Rc8xc4 d3xc4 Qf3d1+ Kg1g2 Qd1xd4
Qa5xa6 Bh6d2 a4a5 Qd4e4+ Kg2g1 Qe4f5 Qa6a7)} 45. Rxc4 {(Rc2xc4)} Rxc4
{(Rc8xc4 d3xc4 Qf3d1+ Kg1g2 Qd1xd4 Qa5xa6 Bh6d2 a4a5 Qd4e4+ Kg2g1 Qe4f5
Qa6a7 Bd2b4 Qa7b7)} 46. dxc4 {(d3xc4)} Qd1+ {(Qf3d1+ Kg1g2 Qd1xd4 Qa5xa6
Bh6d2 a4a5 Qd4e4+ Kg2g1 Qe4f5 Qa6b5 Qf5xb5 c4xb5 Bd2xa5 f2f3)} 47. Kg2
{(Kg1g2)} Qxd4 {(Qd1xd4 Qa5xa6 Bh6d2 a4a5 Qd4e4+ Kg2g1 Qe4f5 Qa6b5 Qf5xb5
c4xb5 Bd2xa5 f2f3 Kh7g7 Kg1f2)} 48. Qxa6 {(Qa5xa6 Bh6f8 Qa6b7 Qd4xc4 a4a5
Qc4a2 Qb7b5 Bf8g7 Qb5c5 Qa2d2)} Bd2 {(Bh6d2)} 49. a5 {(a4a5 Qd4e4+ Kg2g1
Qe4f5 Qa6b5 Qf5xb5 c4xb5 Bd2xa5 Kg1f1 Ba5b6 f2f3 Kh7g7)} Qe4+ {(Qd4e4+
Kg2g1 Qe4f5 c4c5 Qf5xc5 Qa6b7 Bd2xa5 Qb7xf7+ Kh7h6 Kg1g2 Ba5c7 Qf7f3)} 50.
Kg1 {(Kg2g1 Qe4f5 c4c5 Qf5xc5 Qa6b7 Bd2xa5 Qb7xf7+ Kh7h6 Kg1g2 Ba5c7 Qf7f3
Bc7e5 Qf3e4)} Qf5 {(Qe4f5 c4c5 Qf5xc5 Qa6b7 Bd2xa5 Qb7xf7+ Kh7h6 Kg1g2
Ba5c7 Qf7e6 Bc7e5 Qe6e8)} 51. c5 {(c4c5 Qf5xc5 Qa6b7 Bd2xa5 Qb7xf7+ Kh7h6
Kg1g2 Ba5c3 Qf7f3 Bc3d4 Qf3e4 Qc5c3 Qe4e2)} Qxc5 {(Qf5xc5 Qa6b7 Bd2xa5
Qb7xf7+ Kh7h6 Kg1g2 Ba5c7 Qf7e6 Bc7e5 Qe6e8 Qc5d5+ Kg2g1)} 52. Qb7 {(Qa6b7
Bd2xa5 Qb7xf7+ Kh7h6 Kg1g2 Ba5c3 Qf7f3 Bc3d4 Qf3f7 Bd4e5 Qf7e6 Qc5d4 Qe6f7
Be5d6)} Bxa5 {(Bd2xa5 Qb7xf7+ Kh7h6 Kg1g2 Ba5c7 Qf7e6 Bc7e5 Qe6e8 Qc5d5+
Kg2g1 Qd5d6 Kg1g2)} 53. Qxf7+ {(Qb7xf7+ Kh7h6 Kg1g2 Ba5c3 Qf7f3 Bc3d4 Qf3e4
Qc5d6 Qe4f3 Bd4c5 Qf3a8)} Kh6 {(Kh7h6)} 54. Kg2 {(Kg1g2 Ba5c3 Qf7d7 Bc3d4
Qd7d8 Qc5b4 Qd8d7 Qb4d2 Qd7f7 Bd4c5 Qf7f6)} Bc7 {(Ba5c7 Qf7g8 Bc7e5 Qg8e8
Qc5d5+ Kg2g1 Qd5d6 Kg1g2 Kh6g7 Qe8b5 Qd6d4)} 55. Qf6 {(Qf7f6 Bc7e5 Qf6d8
Kh6g7 Qd8d7+ Kg7f6 Qd7d8+ Qc5e7 Qd8c8 Qe7d6 Qc8h8+ Kf6f7 Qh8a8 Qd6d2)} Be5
{(Bc7e5 Qf6d8 Qc5d6 Qd8g8 Qd6c6+ Kg2g1 Qc6f6 Kg1g2 Be5d4 f2f3 Qf6d6)} 56.
Qd8 {(Qf6d8 Qc5c6+ Kg2g1 Qc6d6 Qd8e8 Be5d4 Kg1g2 Qd6d5+ f2f3 Qd5d6 Qe8e2
Kh6g7 Qe2e4 Bd4c5)} Qc6+ {(Qc5c6+ Kg2g1 Qc6f6 Qd8d2+ Kh6g7 Qd2d7+ Qf6f7
Qd7a4 Qf7d5 Qa4e8 Be5d4 Qe8e7+ Qd5f7 Qe7e2)} 57. Kf1 {(Kg2f1 Qc6d6 Qd8e8
Qd6f6 Kf1g2 Be5d4 Qe8e2 Qf6c6+ Kg2g1 Qc6d5 Qe2e7 Qd5f3 Qe7g5+ Kh6g7)} Qf6
{(Qc6f6 Qd8d2+ Kh6g7 Qd2d7+ Qf6f7 Qd7d3 Qf7a7 Qd3b5 Be5d4 Qb5e2 Qa7c5 Kf1g2
Qc5d5+ Qe2f3)} 58. Qd2+ {(Qd8d2+ Kh6g7 Qd2d7+ Qf6f7 Qd7d3 Qf7a7 Kf1g2 Be5d4
Qd3e2 Qa7b7+ f2f3 Qb7b2 Qe2xb2 Bd4xb2)} Kg7 {(Kh6g7 Qd2d7+ Qf6f7 Qd7d3
Qf7a7 Qd3b5 Be5d4 Qb5e2 Qa7c5 Kf1g2 Qc5d5+ Qe2f3 Qd5xf3+ Kg2xf3)} 59. Qd7+
{(Qd2d7+ Qf6f7 Qd7d3 Qf7a7 Qd3e4 Be5d4 Qe4e2 Qa7b7 Qe2e6 Qb7f7 Qe6e2 Qf7f5
Qe2e7+ Qf5f7)} Qf7 {(Qf6f7 Qd7d3 Qf7a7 Qd3b5 Be5d4 Qb5e2 Qa7c5 Kf1g2 Qc5d5+
Qe2f3 Qd5xf3+ Kg2xf3 Kg7f6 Kf3e2)} 60. Qd3 {(Qd7d3 Qf7a7 Qd3e4 Be5d4 Qe4e2
Qa7f7 Kf1g1 Qf7d7 Qe2e4 Qd7a7 Qe4f4 Qa7c5 Kg1g2 Qc5d5+)} Qa7 {(Qf7a7 Qd3b5
Be5d4 Qb5e2 Qa7c5 Kf1g2 Qc5c6+ f2f3 Kg7f6 Qe2d2 Qc6d5)} 61. Qc4 {(Qd3c4
Be5d4 Qc4e2 Qa7f7 Kf1g1 Qf7d7 Qe2e4 Qd7a7 Qe4f4 Qa7c5 Kg1g2 Qc5d5+ Kg2f1
Bd4e5)} Bd4 {(Be5d4 Qc4e2 Qa7c5 Kf1g2 Qc5d5+ f2f3 Qd5e5 Qe2d3 Qe5e3 Qd3xe3
Bd4xe3 f3f4)} 62. Qe2 {(Qc4e2 Qa7f7 Kf1g1 Qf7d7 Qe2e4 Qd7a7 Qe4e2 Qa7f7
Kg1g2 Qf7b7+ Kg2h2 Kg7f6 Qe2d2 Qb7d5)} Qc5 {(Qa7c5 Kf1g2 Qc5d5+ f2f3 Qd5e5
Qe2d3 Qe5e3 Qd3xe3 Bd4xe3 f3f4 Kg7f6)} 63. Kg2 {(Kf1g2 Qc5e5 Qe2d2 Kg7f6
Qd2d3 Qe5d5+ Kg2h2 Kf6f7 Qd3e2 Bd4c5 Qe2b5 Kf7f6 Qb5e2 Bc5d6)} Qd5+
{(Qc5d5+ f2f3 Qd5e5 Qe2d3 Qe5e3 Qd3xe3 Bd4xe3 Kg2f1 Kg7f6 Kf1e2 Be3c5 g3g4
Kf6e6 Ke2d2)} 64. Kg1 {(Kg2g1 Kg7f7 Qe2c2 Kf7f6 Qc2c8 Bd4c5 Qc8h8+ Kf6f5
Qh8c8+ Kf5e4 Qc8e8+ Ke4f3)} Qe5 {(Qd5e5 Qe2f3 Qe5e1+ Kg1g2 Qe1e6 Qf3d3
Qe6d5+ Kg2h2 Kg7f7 Qd3e2 Qd5c5 Kh2g2 Qc5c6+ Kg2h2)} 65. Qf3 {(Qe2f3 Qe5e6
Qf3f4 Qe6d5 Qf4c7+ Kg7f6 Qc7c8 Bd4c5 Qc8h8+ Kf6f5 Qh8c8+ Kf5e4 Qc8e8+
Ke4f3)} Qe1+ {(Qe5e1+ Kg1g2 Qe1e6 Kg2g1 Qe6a2 Kg1g2 Qa2d2 Qf3b7+ Kg7f6
Qb7c6+ Kf6e5 Qc6e8+ Ke5d5 Qe8d7+)} 66. Kg2 {(Kg1g2 Qe1d2 Kg2g1 Qd2c2 Qf3f4
Qc2c5 Kg1f1 Qc5c4+ Kf1g2 Qc4c6+ Kg2g1 Qc6c5 Kg1f1 Qc5c4+)} Qe6 {(Qe1e6
Kg2g1 Qe6f5 Qf3e2 Kg7f6 Kg1g2 Qf5d5+ f2f3 Bd4e5 Qe2e3 Qd5a2+ Kg2h3)} 67.
Qf4 {(Qf3f4 Qe6c6+ Kg2g1 Qc6c5 Kg1g2 Qc5e5 Qf4f3 Qe5e6 Qf3f4 Qe6c6+ Kg2g1
Qc6c5 Kg1g2 Qc5e5)} Qf6 {(Qe6f6 Qf4c7+ Qf6f7 Qc7c2 Qf7b7+ Kg2g1 Kg7f6 Qc2e2
Qb7c6 Qe2d2 Qc6e4 Qd2a5 Kf6e6 Qa5a6+)} 68. Qd2 {(Qf4d2 Qf6b6 Qd2f4 Qb6c6+
Kg2g1 Qc6c5 Kg1g2 Qc5e5 Qf4f3 Qe5e6 Qf3f4 Qe6c6+ Kg2g1 Qc6c5)} Qc6+
{(Qf6c6+ Kg2g1 Qc6d6 Kg1g2 Qd6d5+ Kg2g1 Qd5e4 Qd2d1 Kg7f6 Qd1d2 Kf6f5 Kg1h2
Kf5e6 Qd2a2+)} 69. Kh2 {(Kg2h2 Qc6e4 Qd2b4 Qe4d5 Kh2g1 Kg7f7 Qb4a4 Kf7e7
Qa4c2 Ke7f6 Qc2c8 Bd4c5 Qc8h8+ Kf6f5)} Qd5 {(Qc6d5 Qd2e2 Qd5e5 Qe2d2 Qe5e4
Kh2g1 Qe4b1+ Kg1g2 Qb1b7+ Kg2f1 Qb7d5 Qd2f4 Qd5e5 Qf4f3)} 70. Kg1 {(Kh2g1
Qd5e4 Kg1h2 Kg7f6 Qd2b4 Kf6e6 Qb4b3+ Qe4d5 Qb3c2 Ke6f6 Qc2d3 Kf6f7 Qd3d1
Qd5e4)} Qe4 {(Qd5e4 Kg1h2 Qe4e5 Kh2g2 Qe5d5+ Kg2g1 Qd5e4 Kg1h2 Qe4e5 Kh2g2
Qe5d5+ Kg2g1 Qd5e4 Kg1h2)} 71. Kh2 {(Kg1h2 Kg7f6 Qd2b4 Kf6e6 Qb4b3+ Qe4d5
Qb3c2 Ke6f6 Qc2d3 Kf6f7 Qd3d1 Qd5e4 Qd1b3+ Kf7e7)} Qe5 {(Qe4e5 Kh2g2 Qe5f6
Kg2g1 Qf6d6 Kg1g2 Qd6d5+ Kg2g1 Qd5e4 Kg1h2 Qe4e5 Kh2g2 Qe5f6 Kg2g1)} 72.
Kg2 {(Kh2g2 Kg7f6 Qd2d3 Qe5d5+ Kg2h2 Kf6f7 Qd3d1 Qd5e4 Qd1b3+ Kf7e7 Qb3b4+
Ke7e6 Qb4b3+ Qe4d5)} Kf6 {(Kg7f6 Qd2d3 Qe5d5+ Kg2h2 Kf6f7 Qd3e2 Qd5c5
Qe2f3+ Kf7g7 Kh2g2 Qc5c2 Qf3f4 Qc2c6+ Kg2f1)} 73. Qd3 {(Qd2d3 Qe5d5+ Kg2h2
Kf6f7 Qd3d1 Qd5e4 Qd1b3+ Kf7e7 Qb3b4+ Ke7e6 Qb4b3+ Qe4d5 Qb3c2 Ke6f6)} Qd5+
{(Qe5d5+ Kg2h2 Kf6f7 Qd3e2 Qd5c5 Qe2f3+ Kf7g7 Kh2g2 Qc5f8 Qf3e2 Qf8f5
Qe2e7+ Qf5f7 Qe7e2)} 74. Kh2 {(Kg2h2 Kf6f7 Qd3d1 Qd5e4 Qd1b3+ Kf7e7 Qb3b4+
Ke7e6 Qb4b3+ Qe4d5 Qb3c2 Ke6f6 Qc2d3 Kf6f7)} Kg7 {(Kf6g7 Qd3e2 Qd5e5 Qe2d2
Qe5e4 Kh2g1 Qe4b1+ Kg1g2 Qb1b7+ Kg2g1 Qb7b1+ Kg1g2 Qb1b7+ Kg2g1)} 75. Qd2
{(Qd3d2 Qd5c5 Kh2g1 Qc5b6 Kg1g2 Qb6b7+ Kg2g1 Qb7b2 Qd2f4 Qb2b1+ Kg1h2 Qb1b2
Kh2g2 Bd4e5)} Qe4 {(Qd5e4 Kh2g1 Qe4b1+ Kg1g2 Qb1b7+ Kg2g1 Qb7b1+ Kg1g2
Qb1b7+ Kg2g1 Qb7b1+ Kg1g2 Qb1b7+ Kg2g1)} 76. Qb4 {(Qd2b4 Kg7f7 Qb4b3+ Kf7e7
Qb3c4 Ke7d6 Qc4b4+ Kd6e6 Qb4b3+ Qe4d5 Qb3c2 Ke6f6 Qc2d3 Kf6f7)} Qe5 {(Qe4e5
Kh2g2 Qe5d5+ Kg2g1 Kg7f7 Qb4b8 Qd5e4 Qb8c7+ Kf7e6 Qc7c8+ Ke6d6 Qc8d8+ Kd6c5
Qd8a5+)} 77. Qb7+ {(Qb4b7+ Kg7h6 Qb7f3 Qe5f5 Qf3xf5 g6xf5 Kh2g2 Kh6g6)} Kh6
{(Kg7h6 Qb7b4 Qe5c5 Qb4d2+ Kh6g7 Kh2g2 Qc5d5+ Kg2g1 Qd5e4 Kg1h2)} 78. Qb4
{(Qb7b4 Qe5c5 Qb4d2+ Kh6g7 Kh2g1 Qc5b6 Kg1g2 Qb6b7+ Kg2g1 Qb7b2 Qd2f4
Qb2b1+ Kg1h2 Qb1b2)} Qc5 {(Qe5c5 Qb4d2+ Kh6g7 Kh2g2 Qc5e5 Qd2c2 Qe5d5+
Kg2g1 Kg7f6 Qc2c8 Bd4c5 Qc8e8 Kf6g7 Qe8b8)} 79. Qd2+ {(Qb4d2+ Kh6g7 Kh2g1
Qc5b6 Kg1g2 Qb6b7+ Kg2g1 Qb7b2 Qd2f4 Qb2b6 Kg1f1 Qb6b5+ Kf1g1 Qb5d5)} Kg7
{(Kh6g7 Kh2g2 Qc5e5 Qd2c2 Qe5e6 Qc2c7+ Qe6f7 Qc7c2 Qf7b7+ Kg2g1 Kg7f6 Qc2e2
Qb7c6 Qe2d2)} 80. Kg1 {(Kh2g1 Qc5b6 Kg1g2 Qb6b7+ Kg2g1 Qb7b2 Qd2f4 Qb2b6
Kg1f1 Qb6b5+ Kf1g1 Qb5d5 Qf4c7+ Kg7f6)} Qd6 {(Qc5d6 Kg1g2 Qd6e5 Qd2c2 Qe5e6
Qc2c7+ Qe6f7 Qc7c2 Qf7b7+ Kg2g1 Kg7f6 Qc2e2 Qb7c6 Qe2d2)} 81. Kg2 {(Kg1g2
Qd6b6 Qd2e1 Qb6a7 Kg2f1 Qa7a6+ Kf1g1 Qa6a1 Qe1xa1 Bd4xa1 Kg1f1 Ba1d4 Kf1e2
Kg7f7)} Qe5 {(Qd6e5 Qd2b4 Qe5d5+ Kg2g1 Kg7f7 Qb4b8 Qd5e4 Qb8c7+ Kf7e6
Qc7c8+ Ke6d6 Qc8d8+ Kd6c5 Qd8a5+)} 82. Qc2 {(Qd2c2 Qe5d5+ Kg2g1 Kg7f7
Qc2c7+ Kf7e6 Qc7c8+ Ke6e7 Qc8c7+ Ke7f6 Qc7c8 Bd4c5 Qc8h8+ Kf6f5)} Qd5+
{(Qe5d5+ Kg2g1 Kg7f6 Qc2c8 Bd4c5 Qc8e8 Kf6g7 Qe8b8 Kg7f7 Qb8f4+ Kf7e6 Qf4a4
Ke6e7 Qa4f4)} 83. Kg1 {(Kg2g1 Kg7f7 Qc2c7+ Kf7e6 Qc7c8+ Ke6e7 Qc8c7+ Ke7f6
Qc7c8 Bd4c5 Qc8h8+ Kf6f5 Qh8c3 Kf5g4)} Kf6 {(Kg7f6 Qc2c8 Bd4c5 Qc8e8 Kf6g7
Qe8b8 Kg7f7 Qb8f4+ Kf7e6 Qf4a4 Ke6e7 Qa4f4)} 84. Qc8 {(Qc2c8 Kf6f7 Qc8c7+
Kf7e6 Qc7c8+ Ke6e7 Qc8c7+ Ke7f6 Qc7c8 Kf6f7 Qc8c7+ Kf7e6 Qc7c8+ Ke6e7)} Bc5
{(Bd4c5 Qc8e8 Kf6g7 Qe8b8 Kg7f7 Qb8f4+ Kf7e6 Qf4a4 Bc5d4 Qa4e8+ Ke6f5 Kg1h2
Qd5b7 Qe8f8+)} 85. Qh8+ {(Qc8h8+ Kf6f5 Qh8b8 Qd5d1+ Kg1g2 Qd1c2 Qb8c8+
Kf5e5 Qc8c7+ Ke5d4 Qc7d8+ Kd4c4)} Kf5 {(Kf6f5 Qh8c8+ Kf5e4 Kg1g2 Ke4d4+
f2f3 Qd5a2+ Kg2h3 Bc5d6 Qc8d7)} 86. Qb8 {(Qh8b8 Qd5d1+ Kg1g2 Qd1c2 Qb8c8+
Kf5e5 Qc8c7+ Ke5d4 Qc7d8+ Kd4c4 Qd8g8+ Kc4c3 Qg8h8+ Kc3b3)} Ke4 {(Kf5e4
Qb8b1+ Ke4f3 Qb1c2 Qd5f5 Qc2b2 Kf3e4 Qb2b7+ Ke4d3 Qb7b3+ Kd3d4)} 87. Qf4+
{(Qb8f4+ Ke4d3 Qf4a4 Qd5f5 Qa4b5+ Kd3c3 Qb5a5+ Kc3b3 Qa5b5+ Kb3c2 Qb5e2+
Kc2c3 Qe2e1+ Kc3c4)} Kd3 {(Ke4d3 Qf4c1 Qd5f5 Qc1d1+ Kd3c3 Qd1e1+ Kc3d4
Qe1d2+ Kd4e4 Qd2c2+ Ke4d5 Qc2b3+ Kd5e5 Qb3b8+)} 88. Qa4 {(Qf4a4 Qd5f5
Qa4b5+ Kd3c3 Qb5a5+ Kc3c4 Qa5a2+ Kc4d3 Qa2b2 Kd3e4 Qb2c2+ Ke4d5 Qc2d2+
Kd5c4)} Kd2 {(Kd3d2 Qa4a6 Bc5d4 Qa6a4 Kd2e1 Qa4c2 Qd5f5 Qc2c1+ Ke1e2 Qc1c4+
Qf5d3 Qc4e6+ Ke2d2 Kg1g2)} 89. Qa6 {(Qa4a6 Bc5d4 Qa6a4 Qd5e4 Qa4b4+ Kd2e2
Qb4c4+ Qe4d3 Qc4e6+ Ke2d1 Kg1g2 Qd3e2)} Bd4 {(Bc5d4 Qa6a4 Kd2e1 Qa4e8+
Qd5e5 Qe8xg6 Bd4xf2+ Kg1h2 Bf2d4 Qg6b1+ Ke1d2 Qb1b4+ Bd4c3)} 90. Qa4
{(Qa6a4 Kd2e1 Qa4e8+ Qd5e5 Qe8xg6 Bd4xf2+ Kg1g2 Qe5d5+ Kg2h2 Bf2d4 Qg6c2
Qd5e5)} Ke1 {(Kd2e1 Qa4e8+ Qd5e5 Qe8xg6 Bd4xf2+ Kg1g2 Qe5d5+ Kg2h2 Bf2d4
Qg6g5 Qd5f3)} 91. Qe8+ {(Qa4e8+ Qd5e5 Qe8xg6 Bd4xf2+ Kg1g2 Qe5d5+ Kg2h2
Bf2d4 Qg6c2 Qd5e5 Qc2b1+ Ke1d2 Qb1b4+ Bd4c3)} Qe5 {(Qd5e5 Qe8xg6 Bd4xf2+
Kg1g2 Qe5d5+ Kg2h2 Bf2d4 Qg6c2 Qd5f3 Qc2b1+ Ke1d2)} 92. Qxg6 {(Qe8xg6
Bd4xf2+ Kg1h2 Bf2d4 Qg6d3 Qe5d5 Qd3c2 Qd5e5 Qc2c1+ Ke1f2 Qc1c2+ Kf2f3)}
Bxf2+ {(Bd4xf2+ Kg1g2 Qe5d5+ Kg2h2 Bf2d4 Qg6c2 Bd4e5 Kh2g1 Be5d6 Qc2c1+
Ke1e2)} 93. Kh2 {(Kg1h2 Bf2c5 Qg6c2 Bc5d6 Qc2b1+ Ke1d2 Qb1a2+ Kd2e3 Qa2b3+
Ke3f2 Qb3f7+ Kf2e3)} Bd4 {(Bf2d4 Qg6b1+ Ke1d2 Qb1b4+ Kd2d3 Qb4b3+ Bd4c3
Qb3d1+ Kd3c4 Qd1a4+ Kc4d5 Qa4b5+ Kd5d4 Qb5a4+)} 94. Qb1+ {(Qg6b1+ Ke1d2
Qb1b4+ Kd2e2 Qb4c4+ Ke2e1 Qc4b4+ Ke1f2 Qb4f8+ Kf2e2 Qf8f7 Bd4c5 Kh2g2)} Kd2
{(Ke1d2 Qb1b4+ Kd2d3 Qb4b3+ Bd4c3 Qb3d1+ Kd3c4 Qd1a4+ Kc4d5 Qa4d7+ Kd5c5
Qd7a7+ Kc5b5 Qa7b7+)} 95. Qb4+ {(Qb1b4+ Kd2e2 Qb4c4+ Ke2e1 Qc4b4+ Ke1f2
Qb4d2+ Kf2f3 Qd2d3+ Bd4e3 Qd3f1+ Kf3e4 Qf1c4+ Be3d4)} Kd3 {(Kd2d3 Qb4b3+
Bd4c3 Qb3d1+ Kd3c4 Qd1a4+ Kc4d5 Qa4d7+ Kd5c5 Qd7a7+ Kc5b5 Qa7b7+ Kb5c4
Qb7c6+)} 96. Qb3+ {(Qb4b3+ Bd4c3 Qb3d1+ Kd3c4 Kh2h3 Qe5e6+ Kh3g2 Qe6e4+
Kg2h3)} Ke2 {(Kd3e2 Qb3a2+ Ke2d1 Qa2b3+ Kd1e1 Qb3b1+ Ke1d2 Qb1b4+ Kd2d3
Qb4b3+ Bd4c3 Qb3d1+ Kd3c4 Qd1f1+)} 97. Qf7 {(Qb3f7 Qe5c5 Qf7a2+ Ke2e3
Qa2b3+ Bd4c3 Qb3c2 Qc5d4 Qc2f5)} Bc5 {(Bd4c5 Kh2h3 Ke2e1 Qf7f3 Bc5d6 Qf3h1+
Ke1d2 Qh1g2+ Kd2e3 Qg2g1+ Ke3d3)} 98. Kg2 {(Kh2g2 Bc5d6 Qf7a2+ Ke2d3 Qa2b1+
Kd3d2 Qb1a2+ Kd2e3 Qa2b3+ Ke3d2 Qb3a2+ Kd2e3 Qa2b3+ Ke3d2)} Qe4+ {(Qe5e4+
Kg2h2 Qe4g4 Kh2g2 Bc5d4 Qf7a2+ Ke2e3 Qa2b3+ Ke3e4 Qb3b7+)} 99. Kh2 {(Kg2h2
Qe4g4 Qf7d5 Bc5d4 Kh2g2 Ke2e3 Qd5b3+ Ke3e4 Qb3b7+ Ke4e5)} Qg4 {(Qe4g4 Kh2g2
Bc5d4 Qf7a2+ Ke2e3 Qa2b3+ Ke3e4 Qb3b7+ Ke4e5 Qb7e7+ Ke5d5 Qe7f7+ Kd5c5)}
100. Kg2 {(Kh2g2 Bc5d4 Qf7d5 Ke2e3 Qd5b3+ Ke3e4 Qb3b7+ Ke4e5 Qb7b8+ Ke5d5
Qb8a8+ Kd5c4 Qa8c6+ Kc4b4)} Bd4 {(Bc5d4 Qf7a2+ Ke2e3 Qa2b3+ Ke3e4 Qb3b7+
Ke4e5 Qb7e7+ Ke5d5 Qe7f7+ Kd5d6 Qf7f8+ Kd6e6 Qf8c8+)} 101. Qd5 {(Qf7d5
Ke2e3 Qd5b3+ Ke3e4 Qb3b7+ Ke4e5 Qb7b8+ Ke5d5 Qb8a8+ Kd5c4 Qa8c6+ Kc4b4
Qc6d6+ Kb4c3)} Kd2 {(Ke2d2 Qd5g5+ Kd2c3 Qg5a5+ Kc3c2 Qa5a4+ Kc2d3 Qa4b3+
Kd3e4 Qb3b7+ Ke4e5 Qb7e7+ Ke5d5 Qe7f7+)} 102. Qf3 {(Qd5f3 Qg4g6 Kg2h2 Kd2e1
Kh2g2 Qg6c2+ Kg2h3 Qc2e2)} Kc2 {(Kd2c2 Qf3c6+ Kc2d3 Qc6f3+ Bd4e3 Qf3d5+
Kd3c3 Qd5a5+ Kc3b3 Qa5b5+ Kb3c2 Qb5c6+ Kc2d2 Qc6d5+)} 103. Qf1 {(Qf3f1
Kc2b3 Qf1f3+ Kb3c4 Qf3xg4 h5xg4 h4h5 Kc4d3 h5h6 Kd3e4 Kg2f1 Ke4f3)} Kc3
{(Kc2c3 Qf1f3+ Kc3d2 Qf3d5 Kd2e3 Qd5b3+ Ke3e4 Qb3b7+ Ke4e5 Qb7e7+ Ke5d5
Qe7f7+ Kd5d6 Qf7f8+)} 104. Qf3+ {(Qf1f3+ Kc3c4 Qf3f7+ Kc4d3 Qf7f3+ Qg4xf3+
Kg2xf3 Bd4f6 g3g4 h5xg4+ Kf3xg4 Bf6xh4 Kg4xh4 Kd3e4)} Kd2 {(Kc3d2 Qf3d5
Kd2e3 Qd5b3+ Ke3e4 Qb3b7+ Ke4e5 Qb7e7+ Ke5d5 Qe7f7+ Kd5d6 Qf7f8+ Kd6e6
Qf8c8+)} 105. Qd5 {(Qf3d5 Kd2e3 Qd5b3+ Ke3e4 Qb3b7+ Ke4e5 Qb7b8+ Ke5d5
Qb8a8+ Kd5c4 Qa8c6+ Kc4b4 Qc6d6+ Kb4c3)} Ke3 {(Kd2e3 Qd5b3+ Ke3e4 Qb3b7+
Ke4e5 Qb7e7+ Ke5d5 Qe7f7+ Kd5d6 Qf7f8+ Kd6d7 Qf8f7+ Kd7c6 Qf7f3+)} 106.
Qb3+ {(Qd5b3+ Ke3e4 Qb3b7+ Ke4e5 Qb7b8+ Ke5d5 Qb8a8+ Kd5c4 Qa8c6+ Kc4b4
Qc6d6+ Kb4c3 Qd6c6+ Kc3b4)} Ke4 {(Ke3e4 Qb3b7+ Ke4e5 Qb7e7+ Ke5d5 Qe7f7+
Kd5d6 Qf7f8+ Kd6d7 Qf8f7+ Kd7c6 Qf7f3+ Qg4xf3+ Kg2xf3)} 107. Qb7+ {(Qb3b7+
Ke4e5 Qb7b8+ Ke5d5 Qb8a8+ Kd5c4 Qa8c6+ Kc4b4 Qc6d6+ Kb4c3 Qd6c6+ Kc3d3
Qc6f3+ Qg4xf3+)} Ke5 {(Ke4e5 Qb7e7+ Ke5d5 Qe7f7+ Kd5d6 Qf7f8+ Kd6d7 Qf8f7+
Kd7c6 Qf7f3+ Qg4xf3+ Kg2xf3 Kc6d5 g3g4)} 108. Qb8+ {(Qb7b8+ Ke5d5 Qb8a8+
Kd5c4 Qa8c6+ Kc4b4 Qc6d6+ Kb4c3 Qd6c6+ Kc3d3 Qc6f3+ Qg4xf3+ Kg2xf3 Bd4f6)}
Kd5 {(Ke5d5 Qb8b3+ Kd5e5 Qb3b8+ Ke5d5 Qb8b3+ Kd5e5 Qb3b8+ Ke5d5 Qb8b3+
Kd5e5 Qb3b8+ Ke5d5 Qb8b3+)} 109. Qa8+ {(Qb8a8+ Kd5c4 Qa8c6+ Kc4b4 Qc6d6+
Kb4c3 Qd6c6+ Kc3d3 Qc6f3+ Qg4xf3+ Kg2xf3 Bd4f6 g3g4 h5xg4+)} Kd6 {(Kd5d6
Qa8f8+ Kd6d7 Qf8f7+ Kd7c6 Qf7f3+ Qg4xf3+ Kg2xf3 Kc6d5 g3g4 Bd4b2 g4xh5
Bb2c1 Kf3g2)} 110. Qf8+ {(Qa8f8+ Kd6d7 Qf8f7+ Kd7c6 Qf7f3+ Kc6c5 Qf3f8+
Kc5d5 Qf8f7+ Kd5d6 Qf7f3 Kd6e5 Qf3xg4 h5xg4)} Kd7 {(Kd6d7 Qf8f7+ Kd7c6
Qf7f3+ Kc6c5 Qf3f8+ Kc5c4 Qf8f1+ Kc4b4 Qf1e1+ Kb4b3 Qe1f1 Kb3c2 Qf1c4+)}
111. Qf7+ {(Qf8f7+ Kd7c6 Qf7f3+ Kc6c5 Qf3f8+ Kc5c4 Qf8f7+ Kc4b4 Qf7b7+
Kb4c5 Qb7f3 Kc5d6 Qf3f8+ Kd6d7)} Kc6 {(Kd7c6 Qf7f3+ Kc6c5 Qf3f8+ Kc5c4
Qf8f1+ Kc4b4 Qf1e1+ Kb4b3 Qe1f1 Kb3c2 Qf1c4+ Kc2b2 Qc4b5+)} 112. Qf3+
{(Qf7f3+ Kc6c5 Qf3f8+ Kc5c4 Qf8f7+ Kc4b4 Qf7b7+ Kb4c5 Qb7f3 Kc5d6 Qf3f8+
Kd6d7 Qf8f7+ Kd7c6)} Kc5 {(Kc6c5 Qf3f8+ Kc5c4 Qf8f1+ Kc4b4 Qf1e1+ Kb4b3
Qe1f1 Kb3c2 Qf1c4+ Kc2b2 Qc4b5+ Kb2a3 Qb5a5+)} 113. Qf8+ {(Qf3f8+ Kc5c4
Qf8f7+ Kc4b4 Qf7b7+ Kb4c5 Qb7f3 Kc5d6 Qf3f8+ Kd6d7 Qf8f7+ Kd7c6 Qf7f3+
Kc6c5)} Kc4 {(Kc5c4 Qf8f1+ Kc4b4 Qf1e1+ Kb4b3 Qe1f1 Kb3c2 Qf1c4+ Kc2b2
Qc4b5+ Kb2c1 Qb5g5+ Kc1d1 Qg5d5)} 114. Qf7+ {(Qf8f7+ Kc4b4 Qf7b7+ Kb4c5
Qb7f3 Kc5d6 Qf3f8+ Kd6d7 Qf8f7+ Kd7c6 Qf7f3+ Kc6c5 Qf3f8+ Kc5c4)} Kd3
{(Kc4d3 Qf7f3+ Bd4e3 Qf3d5+ Kd3c3 Qd5a5+ Kc3b3 Qa5b5+ Kb3c2 Qb5c6+ Kc2d2
Qc6d5+ Be3d4 Qd5g5+)} 115. Qf3+ {(Qf7f3+ Bd4e3 Qf3d5+ Kd3c3 Qd5c6+ Kc3d2
Qc6d5+ Kd2e1 Qd5f3 Be3c1 Qf3c3+ Ke1d1 Qc3d3+ Bc1d2)} Be3 {(Bd4e3 Qf3d5+
Kd3c3 Qd5a5+ Kc3c4 Qa5a4+ Kc4d5 Qa4a5+ Kd5e4 Qa5a4+ Be3d4 Qa4c6+ Ke4e5
Qc6e8+)} 116. Qd5+ {(Qf3d5+ Kd3c3 Qd5c6+ Kc3d2 Qc6d5+ Kd2e1 Qd5f3 Be3c1
Qf3c3+ Ke1d1 Qc3d3+ Bc1d2 Qd3b3+ Kd1c1)} Kc3 {(Kd3c3 Qd5a5+ Kc3c4 Qa5a4+
Kc4d5 Qa4b3+ Kd5d4 Qb3b6+ Kd4d3 Qb6b3+ Kd3e2 Qb3b5+ Ke2e1 Qb5d3)} 117. Qc6+
{(Qd5c6+ Kc3d2 Qc6d5+ Kd2e1 Qd5f3 Be3c1 Qf3c3+ Ke1d1 Qc3d3+ Bc1d2 Qd3b3+
Kd1c1 Qb3a3+ Kc1c2)} Kb2 {(Kc3b2 Qc6b5+ Kb2c1 Qb5c6+ Kc1d1 Qc6f3+ Kd1d2
Qf3d5+ Be3d4 Qd5g5+ Kd2c3 Qg5a5+ Kc3c2 Qa5a4+)} 118. Qb5+ {(Qc6b5+ Kb2c2
Qb5c6+ Kc2d2 Qc6d5+ Kd2e1 Qd5f3 Be3c1 Qf3c3+ Ke1d1 Qc3d3+ Bc1d2 Qd3b3+
Kd1c1)} Kc1 {(Kb2c1 Qb5c6+ Kc1d1 Qc6f3+ Kd1d2 Qf3d5+ Kd2e2 Qd5c6 Be3d2
Qc6b5+ Ke2e3 Qb5c5+ Ke3d3 Qc5d5+)} 119. Qc6+ {(Qb5c6+)} Kd1 {(Kc1d1 Qc6f3+
Kd1d2 Qf3d5+ Kd2e2 Qd5c6 Be3d2 Qc6b5+ Ke2e3 Qb5c5+ Ke3d3 Qc5d5+ Kd3c3
Qd5a5+)} 120. Qf3+ {(Qc6f3+)} Kd2 {(Kd1d2)} 121. Qd5+ {(Qf3d5+)} Ke2
{(Kd2e2 Qd5c6 Be3d2 Qc6b5+ Ke2e3 Qb5c5+ Ke3d3 Qc5d5+ Kd3c3 Qd5a5+ Kc3c2
Qa5a2+ Kc2d1 Qa2b1+)} 122. Qb5+ {(Qd5b5+ Ke2e1 Qb5b1+ Qg4d1 Qb1xd1+ Ke1xd1
Kg2f3 Kd1d2 g3g4 Kd2d3 g4xh5 Be3h6 Kf3g2 Kd3e4)} Ke1 {(Ke2e1 Qb5d3 Be3c1
Qd3f3 Ke1d2 Qf3d5+ Kd2e2 Qd5c6 Bc1d2 Qc6b5+ Ke2e3 Qb5c5+ Ke3d3 Qc5d5+)}
123. Qb1+ {(Qb5b1+)} Kd2 {(Ke1d2 Qb1a2+ Kd2c3 Qa2a5+ Kc3c4 Qa5a4+ Kc4d5
Qa4b3+ Kd5d4 Qb3b6+ Kd4e4 Qb6c6+ Ke4e5 Qc6b5+)} 124. Qa2+ {(Qb1a2+ Kd2e1
Qa2b1+ Qg4d1 Qb1xd1+ Ke1xd1 Kg2f3 Kd1d2 g3g4 Kd2d3 g4xh5 Be3h6 Kf3g2
Kd3e4)} Kc3 {(Kd2c3 Qa2a5+ Kc3c4 Qa5a4+ Kc4d5 Qa4b3+ Kd5d4 Qb3b6+ Kd4d3
Qb6b5+ Kd3c2 Qb5c6+ Kc2d2 Qc6d5+)} 125. Qa3+ {(Qa2a3+ Kc3d4 Qa3b4+ Kd4e5
Qb4b8+ Ke5d5 Qb8b3+ Kd5e4 Qb3b1+ Ke4e5 Qb1b8+ Ke5d5 Qb8b3+ Kd5e4)} Kd4
{(Kc3d4)} 126. Qb4+ {(Qa3b4+ Kd4e5 Qb4b8+ Ke5d5 Qb8b3+ Kd5e4 Qb3b1+ Ke4e5
Qb1b8+ Ke5d5 Qb8b3+ Kd5e4 Qb3b1+ Ke4e5)} Kd5 {(Kd4d5 Qb4b3+ Kd5e4 Qb3b7+
Ke4f5 Qb7d5+ Kf5f6 Qd5d8+ Kf6f7 Qd8d5+ Kf7e7 Qd5b7+ Ke7d6 Qb7b8+)} 127.
Qb3+ {(Qb4b3+ Kd5e4 Qb3b1+ Ke4e5 Qb1b8+ Ke5d5 Qb8b3+ Kd5e4 Qb3b1+ Ke4e5
Qb1b8+ Ke5d5 Qb8b3+ Kd5e4)} Ke4 {(Kd5e4 Qb3b7+ Ke4f5 Qb7d5+ Kf5f6 Qd5d8+
Kf6f7 Qd8c7+ Kf7e6 Qc7c6+ Ke6e5 Qc6b5+ Ke5f6 Qb5c6+)} 128. Qb1+ {(Qb3b1+
Ke4e5 Qb1b8+ Ke5d5 Qb8b3+ Kd5e4 Qb3b1+ Ke4e5 Qb1b8+ Ke5d5 Qb8b3+ Kd5e4
Qb3b1+ Ke4e5)} Ke5 {(Ke4e5 Qb1b8+ Ke5f5 Qb8c8+ Kf5e4 Qc8b7+ Ke4f5 Qb7d5+
Kf5f6 Qd5d8+ Kf6f7 Qd8c7+ Kf7e6 Qc7c6+)} 129. Qb8+ {(Qb1b8+ Ke5d5 Qb8b3+
Kd5e4 Qb3b1+ Ke4e5 Qb1b8+ Ke5d5 Qb8b3+ Kd5e4 Qb3b1+ Ke4e5 Qb1b8+ Ke5d5)}
Kf5 {(Ke5f5 Qb8c8+ Kf5e4 Qc8b7+ Ke4f5 Qb7c8+ Kf5e4 Qc8b7+ Ke4f5 Qb7c8+
Kf5e4 Qc8b7+ Ke4f5 Qb7c8+)} 130. Qc8+ {(Qb8c8+ Kf5e4 Qc8b7+ Ke4e5 Qb7b8+
Ke5d5 Qb8b3+ Kd5e4 Qb3b1+ Ke4e5 Qb1b8+ Ke5d5 Qb8b3+ Kd5e4)} Ke4 {(Kf5e4
Qc8b7+ Ke4f5 Qb7c8+ Kf5e4 Qc8b7+ Ke4f5 Qb7c8+ Kf5e4 Qc8b7+ Ke4f5 Qb7c8+
Kf5e4 Qc8b7+)} 131. Qb7+ {(Qc8b7+ Ke4e5 Qb7b8+ Ke5d5 Qb8b3+ Kd5e4 Qb3b1+
Ke4e5 Qb1b8+ Ke5d5 Qb8b3+ Kd5e4 Qb3b1+ Ke4e5)} Kf5 {(Ke4f5 Qb7c8+ Kf5e4
Qc8b7+ Ke4f5 Qb7c8+ Kf5e4 Qc8b7+ Ke4f5 Qb7c8+ Kf5e4 Qc8b7+ Ke4f5 Qb7c8+)}
132. Qc8+ {(Qb7c8+ Kf5e4 Qc8b7+ Ke4e5 Qb7b8+ Ke5d5 Qb8b3+ Kd5e4 Qb3b1+
Ke4e5 Qb1b8+ Ke5d5 Qb8b3+ Kd5e4)} Ke4 {(Kf5e4 Qc8b7+ Ke4f5 Qb7c8+ Kf5e4
Qc8b7+ Ke4f5 Qb7c8+ Kf5e4 Qc8b7+ Ke4f5 Qb7c8+ Kf5e4 Qc8b7+)} 133. Qb7+
{(Qc8b7+ Ke4e5 Qb7b8+ Ke5d5 Qb8b3+ Kd5e4)} Kf5 {(Ke4f5 Qb7c8+ Kf5e4 Qc8b7+
Ke4f5 Qb7c8+ Kf5e4 Qc8b7+ Ke4f5 Qb7c8+ Kf5e4 Qc8b7+ Ke4f5 Qb7c8+)} 134.
Qc8+ {(Qb7c8+ Kf5e4 Qc8b7+ Ke4e5 Qb7b8+ Ke5d5 Qb8b3+ Kd5e4) 3-fold
repetition} 1/2-1/2

[pichy]

Can you provide a link to download the games please
Don't post them here,they'll rip you off for that
Dr.D

Here is the Link:
http://remixshare.com/?file=dhtfokyr2idflja

[Tommy]

I can only imagine that such blunders come into a book by importing a "broken" game. I guess almost all big databases to work with, will contain a couple of such games.

But normally, an Arena book will never play such moves if the book option

Minimal number of games: 2
(or bigger; Fritz' "optimal setting" value is 3 here)

because it is highly unlikely that moves like 6...Ba3 and 9...Qc6 were played more than once. - The min. percentages should be another safety net against such moves, although if a game was broken the result could be wrong, too.

So, even if a book or the database it is based upon, does contain some of such blunders, proper book options should prevent that they are played from an Arena book.

P.S. My most recent free Arena book is based on Norm Pollock's HQ. collection of IM/GM games, quite big and by default with max. 40 plies:

You might be surprised to know that it's usually more than just a couple of games that are broken in these pgn files. I have downloaded a number of pgn files and all contained games with huge errors. This can be of concern if you are using these pgn file to create your opening book.

Norm Pollock produces some of the cleanest and the most error free pgn files that I have come across. Despite Norms efforts his pgn files still contain a surprising number of bad games. Below are the results of scanning Norms pgn file 'SuperGmb.pgn'. I was only looking for very big mistakes (queen suicides), so games that contain rook, bishop or knight sacs went undetected.



File: SuperGmb.pgn

#395
[Event "FIDE WCh KO, Groning"]
[Site "FIDE WCh KO, Groning"]
[Date "1997.??.??"]
[Round "?"]
[White "Korchnoi, Viktor L."]
[Black "Short, Nigel D."]
[Result "1/2-1/2"]
[WhiteElo "2635"]
[BlackElo "2690"]
[ECO "A10"]

1. c4 b6 2. e4 Bb7 3. Nc3 e5 4. d3 Nc6 5. g3 Bc5 6. Bg2 Nge7 7. Nf3 O-O
8. O-O a5 9. Be3 d6 10. d4 exd4 11. Nxd4 Nxd4 12. Bxd4 Nc6 13. Bxc5 bxc5
14. e5 dxe5 15. Na4 Qd6 16. Qd5 Nb8 17. Qxc5 Qf6 18. Qd6 Bf3 19. Qxc7 Bd1
20. Raxd1 Qd6 21. b3 Qxd1 22. Qd8 Nd7 23. Nc3 Nb8 24. f4 g5 25. Qxb8 Qc2
26. Qxa8 1/2-1/2


#1907
[Event "Korchnoi 70"]
[Site "St Petersburg RUS"]
[Date "2001.??.??"]
[Round "1"]
[White "Taimanov, Mark E."]
[Black "Korchnoi, Viktor L."]
[Result "1/2-1/2"]
[WhiteElo "2454"]
[BlackElo "2639"]
[ECO "A36a"]

1. c4 c5 2. Nc3 Nc6 3. g3 e5 4. Bg2 g6 5. a3 Bg7 6. e3 a5 7. Nge2 d6
8. d3 Nge7 9. O-O O-O 10. Nd5 Rb8 11. Nec3 Nxd5 12. Nxd5 Bd7 13. e4 Ne7
14. Rb1 f5 15. Bd2 Kh8 16. Qc1 Ng8 17. f4 exf4 18. Bxf4 Bd4+ 19. Kh1 Qf6
20. Bg5 Qg7 21. Bf4 Be5 22. b4 axb4 23. axb4 b6 24. Bh3 fxe4 25. dxe4 Bxf4
26. gxf4 Nf6 27. Bg2 Rbe8 28. Qc2 Qh6 29. Qc3 Kg8 30. e5 Nh5 31. exd6 Nxf4
32. Nxf4 Rxf4 33. Rxf4 Qxf4 34. bxc5 bxc5 1/2-1/2


#2501
[Event "Madrid ESP"]
[Site "Madrid ESP"]
[Date "1988.??.??"]
[Round "?"]
[White "Gurevich, Mikhail N."]
[Black "Korchnoi, Viktor L."]
[Result "1/2-1/2"]
[WhiteElo "2625"]
[BlackElo "2640"]
[ECO "A52g"]

1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. Nf3 Bc5 5. e3 Nc6 6. Be2 Ngxe5
7. O-O Nxf3+ 8. Bxf3 Ne5 9. Be2 O-O 10. Nc3 a5 11. b3 Re8 12. Bb2 Ra6
13. Ne4 Ba7 14. Qd5 Rae6 15. c5 c6 16. Qd2 d5 17. Bxe5 Rxe5 18. Qxa5 Bb8
19. g3 g6 20. a4 h5 21. Rad1 Kg7 22. Rd4 Ba7 23. Rd3 b5 24. axb5 cxb5
25. Rfd1 Rf5 26. Rxd5 Bxc5 27. Kf1 Kh6 28. h4 Kg7 29. Bf3 Kh6 30. Bg2
1/2-1/2


#2843
[Event "VSB"]
[Site "Rotterdam VSB"]
[Date "1990.??.??"]
[Round "4"]
[White "Korchnoi, Viktor L."]
[Black "Gurevich, Mikhail N."]
[Result "1-0"]
[WhiteElo "2625"]
[BlackElo "2645"]
[ECO "A81"]

1. d4 f5 2. g3 Nf6 3. Bg2 g6 4. Nh3 d6 5. Nc3 Bg7 6. Nf4 c6 7. d5 e5
8. h4 Qe7 9. h5 g5 10. h6 Bf8 11. Nh5 Rg8 12. Nxf6+ Qxf6 13. e4 Bxh6
14. Qf3 fxe4 15. Qxe4 Rg6 16. Be3 Nd7 17. O-O-O a6 18. Rxh6 Rxh6
19. Bxg5 Qe6 20. Qd4 Nf6 21. a3 Qe7 22. Rd3 Qe6 23. Na4 Nxd5 24. c4 Nf6
25. Qb6 Qe7 26. Qa7 Qc7 27. Qd4 Nd5 28. Nb6 1-0


#10672
[Event "Fontys"]
[Site "Fontys Tilburg"]
[Date "1997.??.??"]
[Round "9"]
[White "Polgar, Judit"]
[Black "Shirov, Alexei D."]
[Result "1-0"]
[WhiteElo "2645"]
[BlackElo "2690"]
[ECO "C78m"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 Bc5 7. a4 Rb8
8. axb5 axb5 9. Nxe5 Nxe5 10. d4 Bxd4 11. Qxd4 d6 12. f4 Nc6 13. Qc3 Ne7
14. Ra7 c5 15. e5 Nfd5 16. Bxd5 f6 17. Qh3 Be6 18. b4 Bc8 19. Be4 Nd5
20. exf6 Bg4 21. Rc7 Qe7 22. Kf2 Ra8 23. f7+ Kd8 24. Rxc5 Rb8 25. Bxd5 Rf8
26. Bb2 1-0


#12253
[Event "RS"]
[Site "Ostende RS"]
[Date "1907.??.??"]
[Round "?"]
[White "Janowski, Dawid M."]
[Black "Marshall, Frank J."]
[Result "1-0"]
[ECO "D00a"]

1. d4 d5 2. Nd2 Nf6 3. Ngf3 c5 4. e3 Nc6 5. dxc5 e5 6. Bb5 Qc7 7. b4 e4
8. Nd4 Bg4 9. f3 exf3 10. gxf3 Bd7 11. Bxc6 bxc6 12. Bb2 Rb8 13. Bc3 Be7
14. Ne4 Kf8 15. h4 Ng4 16. Qc1 f5 17. Ke2 Bf6 18. Nd2 g5 19. a4 Qd6
20. Bb2 Be7 21. Ne4 a5 22. Bc3 Bd8 23. Bd2 Kg8 24. Nxc6 Bb6 25. Be1 Ne5
26. Bf2 axb4 27. Rg1 Rb7 28. Ng3 Qc7 29. h5 Qd6 30. Qd2 Bd8 31. Rac1 Bb6
32. Nd4 Ba5 33. Qe1 Rb5 34. c4 1-0


#14504
[Event "DSB-18.Kongress"]
[Site "Breslau"]
[Date "1912.??.??"]
[Round "4"]
[White "Schlechter, Carl"]
[Black "Rubinstein, Akiba K."]
[Result "1/2-1/2"]
[ECO "D37m"]

1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. Nc3 Be7 5. Bf4 O-O 6. e3 c5 7. Rc1 Nc6
8. Bd3 dxc4 9. Bxc4 cxd4 10. exd4 b6 11. O-O Bb7 12. a3 Rc8 13. Ba2 Qc7
14. Be3 Ng4 15. Qe2 Bd6 16. Rcd1 Nxe3 17. fxe3 Ne7 18. e4 Ng6 19. Ng5 Bf4
20. Qh5 Be3+ 21. Kh1 Bxg5 22. Qxg5 Qe7 23. Qxe7 Nxe7 24. d5 exd5
25. exd5 Ng6 26. Rfe1 Rfd8 27. Kg1 Kf8 28. Rd2 Rd7 29. Re3 Rcd8 30. Kf2 Nf4
31. Re5 f6 32. Re4 Ng6 33. Ra4 Bc6 34. Rad4 Ne7 35. Rd1 Bb7 36. R1d2 g6
37. Ra4 Bc6 38. Rad4 Kg7 39. Bb3 1/2-1/2


#14574
[Event "Ch World (match)"]
[Site "Ch World (match)"]
[Date "1978.??.??"]
[Round "21"]
[White "Korchnoi, Viktor L."]
[Black "Karpov, Anatoly"]
[Result "1-0"]
[ECO "D37u"]

1. c4 Nf6 2. Nc3 e6 3. Nf3 d5 4. d4 Be7 5. Bf4 O-O 6. e3 c5 7. dxc5 Bxc5
8. Qc2 Nc6 9. Rd1 Qa5 10. a3 Re8 11. Nd2 e5 12. Bg5 Nd4 13. Qb1 Bf5
14. Bd3 e4 15. Bc2 Nxc2+ 16. Qxc2 Qa6 17. O-O b5 18. a4 Bf8 19. axb5 Bb4
20. Na4 Bd6 21. b6 Bb8 22. Nc5 Bd6 23. b7 Be5 24. f4 exf3 25. h3 h5
26. g4 hxg4 27. hxg4 Bd6 28. e4 1-0


#6952
[Site "Linares ESP"]
[Date "1990.??.??"]
[Round "?"]
[White "Ivanchuk, Vassily"]
[Black "Kasparov, Garry"]
[Result "0-1"]
[WhiteElo "2665"]
[BlackElo "2800"]
[ECO "B97s"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Qb6
8. Qd2 Qxb2 9. Rb1 Qa3 10. f5 Nc6 11. fxe6 fxe6 12. Nxc6 bxc6 13. Be2 Be7
14. O-O O-O 15. Rb3 Qc5+ 16. Be3 Qe5 17. Bf4 Qc5+ 18. Kh1 Ng4 19. h3 e5
20. Na4 Qa5 21. Bc4+ Kh8 22. hxg4 exf4 23. Nb6 d5 24. exd5 cxd5
25. Bxd5 Rb8 26. Nxc8 Rbxc8 27. Rh3 Qb6 28. Re1 Bg5 29. Re6 Qd8 30. c4 Rb8
31. Qd3 Bh4 32. Be4 Qg5 33. Bxh7 Rfd8 34. Qc2 f3 35. Rxf3 Rd2 36. Qe4 Rd1+
37. Kh2 Re1 38. Qf5 Rxe6 39. Qxe6 Kxh7 40. Qe4+ g6 41. Ra3 Kg7 42. Qd4+ Kg8
43. Qe4 Qf6 0-1


#17228
[Event "Ch URS RUS"]
[Site "Ch URS Moscow RUS"]
[Date "1988.??.??"]
[Round "7"]
[White "Vaganian, Rafael A."]
[Black "Beliavsky, Alexander G."]
[Result "0-1"]
[WhiteElo "2625"]
[BlackElo "2645"]
[ECO "E05s"]

1. c4 e6 2. g3 d5 3. Bg2 Nf6 4. Nf3 Be7 5. O-O O-O 6. d4 dxc4 7. Qc2 a6
8. Qxc4 b5 9. Qc2 Bb7 10. Bd2 Nc6 11. e3 Nb4 12. Bxb4 Bxb4 13. Rd1 Rc8
14. a3 Bd6 15. b4 a5 16. bxa5 Ra8 17. Qd2 b4 18. Ne1 Bxg2 19. Nxg2 Ne4
20. Ne1 Ng5 21. h4 Ne4 22. Nc3 Rb8 23. Nd3 Be7 24. Nxb4 Rb6 25. axb6 Bxb4
26. h5 0-1


#17468
[Event "Soviet Union"]
[Site "Soviet Union"]
[Date "1979.??.??"]
[Round "?"]
[White "Polugaevsky, Lev A."]
[Black "Smyslov, Vassily V."]
[Result "1-0"]
[ECO "E11m"]

1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 a5 5. g3 d6 6. Bg2 Nbd7 7. O-O e5
8. Nc3 exd4 9. Nxd4 Nd5 10. Qc2 Ne5 11. Bg5 h6 12. Bf6 Qxf6 13. Nxd5 Qd8
14. Nxb4 axb4 15. c5 c6 16. Rfd1 d5 17. e4 Bg4 18. Re1 dxe4 19. Rxe4 Rc8
20. Rae1 Qd7 21. h3 Bxh3 22. Bxh3 Qxd4 23. Bg2 Qd5 24. f4 Ra8 25. fxe5 b3
26. Qc3 Rd8 27. e6 fxe6 28. Rg4 Qd7 29. Qxb3 g5 30. Qc3 Ra8 31. Kh1 e5
32. Rge4 1-0


#7877
[Site "Rotterdam NED"]
[Date "1990.??.??"]
[Round "?"]
[White "Short, Nigel D."]
[Black "Gurevich, Mikhail N."]
[Result "1/2-1/2"]
[WhiteElo "2635"]
[BlackElo "2645"]
[ECO "C11t"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 5. Nxe4 Be7 6. Bxf6 Bxf6
7. Nf3 O-O 8. c3 Nd7 9. Qc2 e5 10. O-O-O exd4 11. Nxd4 Bxd4 12. Rxd4 Qe7
13. h4 Ne5 14. Ng5 g6 15. Qe2 Qf6 16. Ne4 Qf4+ 17. Nd2 Qf6 18. h5 Bf5
19. hxg6 Bxg6 20. Ne4 Nc6 21. Ra4 a6 22. Qc4 Qe5 23. Qd5 Qxd5 24. Nf6+ Kg7
25. Nxd5 Rfe8 26. Rah4 Re1+ 27. Kd2 Rb1 28. Bd3 Rxh1 29. Rxh1 Rd8
30. c4 Ne5 31. Bxg6 hxg6 32. Kc3 c6 33. Nf4 g5 34. Rh5 Kf6 35. Rh6+ Ke7
36. Rh5 Kf6 37. Rh6+ Ke7 38. Rh5 Nxc4 39. Rxg5 Nb6 40. b3 Kf6 41. Rh5 Rd1
42. a4 1/2-1/2


#9978
[Event "St Petersburg"]
[Site "St Petersburg"]
[Date "1913.??.??"]
[Round "?"]
[White "Alekhine, Alexander A."]
[Black "Bogoljubow, Efim D."]
[Result "0-1"]
[ECO "C64d"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 Nge7 5. d4 exd4 6. cxd4 Bb4+
7. Bd2 Bxd2+ 8. Qxd2 a6 9. Ba4 d5 10. exd5 Qxd5 11. Nc3 Qe6+ 12. Kf1 Qc4+
13. Kg1 O-O 14. d5 Rd8 15. Qe1 Bg4 16. Bb3 Qf4 17. dxc6 Bxf3 18. Qxe7 Bxc6
19. h4 Rd2 20. Rf1 Re8 21. Qg5 Rxf2 22. Bxf7+ Kh8 23. Rd1 Qxf7 24. Rd2 h6
25. Rxf2 Re1+ 26. Kh2 Qxf2 27. Qg4 Bxg2 0-1



Position summary of above games...

Game# 395, Diff= 1200, Move 18, Score= 785 - rn3rk1/1bp2ppp/5q2/p1Q1p3/N1P5/6P1/PP3PBP/R4RK1 w - - sm Qd6; c0 "Korchnoi, Viktor L. vs Short, Nigel D. 1997.??.??";
Game# 395, Diff= 1088, Move 18, Score=-306 - rn3rk1/1bp2ppp/3Q1q2/p3p3/N1P5/6P1/PP3PBP/R4RK1 b - - sm Bf3; c0 "Korchnoi, Viktor L. vs Short, Nigel D. 1997.??.??";
Game# 395, Diff= 1350, Move 20, Score=-1861 - rn3rk1/2Q2ppp/5q2/p3p3/N1P5/6P1/PP3PBP/3R1RK1 b - - sm Qd6; c0 "Korchnoi, Viktor L. vs Short, Nigel D. 1997.??.??";
Game# 1907, Diff= 873, Move 19, Score=-891 - 1r1q1rnk/1p1b3p/3p2p1/p1pN1p2/2PbPB2/P2P2P1/1P4BP/1RQ2R1K b - - sm Qf6; c0 "Taimanov, Mark E. vs Korchnoi, Viktor L. 2001.??.??";
Game# 1907, Diff= 870, Move 20, Score=-21 - 1r3rnk/1p1b3p/3p1qp1/p1pN1p2/2PbPB2/P2P2P1/1P4BP/1RQ2R1K w - - sm Bg5; c0 "Taimanov, Mark E. vs Korchnoi, Viktor L. 2001.??.??";
Game# 2501, Diff= 1110, Move 18, Score= 1031 - 2bqr1k1/bp3ppp/2p5/p1Ppr3/4N3/1P2P3/P2QBPPP/R4RK1 w - - sm Qxa5; c0 "Gurevich, Mikhail N. vs Korchnoi, Viktor L. 1988.??.??";
Game# 2501, Diff= 1109, Move 18, Score=-78 - 2bqr1k1/bp3ppp/2p5/Q1Ppr3/4N3/1P2P3/P3BPPP/R4RK1 b - - sm Bb8; c0 "Gurevich, Mikhail N. vs Korchnoi, Viktor L. 1988.??.??";
Game# 2501, Diff= 1196, Move 19, Score= 1121 - 1bbqr1k1/1p3ppp/2p5/Q1Ppr3/4N3/1P2P3/P3BPPP/R4RK1 w - - sm g3; c0 "Gurevich, Mikhail N. vs Korchnoi, Viktor L. 1988.??.??";
Game# 2501, Diff= 1204, Move 19, Score=-85 - 1bbqr1k1/1p3ppp/2p5/Q1Ppr3/4N3/1P2P1P1/P3BP1P/R4RK1 b - - sm g6; c0 "Gurevich, Mikhail N. vs Korchnoi, Viktor L. 1988.??.??";
Game# 2501, Diff= 890, Move 20, Score= 810 - 1bbqr1k1/1p3p1p/2p3p1/Q1Ppr3/4N3/1P2P1P1/P3BP1P/R4RK1 w - - sm a4; c0 "Gurevich, Mikhail N. vs Korchnoi, Viktor L. 1988.??.??";
Game# 2501, Diff= 887, Move 20, Score=-77 - 1bbqr1k1/1p3p1p/2p3p1/Q1Ppr3/P3N3/1P2P1P1/4BP1P/R4RK1 b - - sm h5; c0 "Gurevich, Mikhail N. vs Korchnoi, Viktor L. 1988.??.??";
Game# 2843, Diff= 1171, Move 14, Score=-1101 - rnb1k1r1/pp5p/2pp1q1b/3Pppp1/4P3/2N2QP1/PPP2PB1/R1B1K2R b KQq - sm fxe4; c0 "Korchnoi, Viktor L. vs Gurevich, Mikhail N. 1990.??.??";
Game# 2843, Diff= 1169, Move 15, Score= 68 - rnb1k1r1/pp5p/2pp1q1b/3Pp1p1/4p3/2N2QP1/PPP2PB1/R1B1K2R w KQq - sm Qxe4; c0 "Korchnoi, Viktor L. vs Gurevich, Mikhail N. 1990.??.??";
Game# 2843, Diff= 1449, Move 19, Score=-928 - r1b1k3/1p1n3p/p1pp1q1r/3Pp1B1/4Q3/2N3P1/PPP2PB1/2KR4 b q - sm Qe6; c0 "Korchnoi, Viktor L. vs Gurevich, Mikhail N. 1990.??.??";
Game# 2843, Diff= 1136, Move 20, Score= 203 - r1b1k3/1p1n3p/p1ppq2r/3Pp1B1/4Q3/2N3P1/PPP2PB1/2KR4 w q - sm Qd4; c0 "Korchnoi, Viktor L. vs Gurevich, Mikhail N. 1990.??.??";
Game# 6952, Diff= 1036, Move 20, Score=-1006 - r1b2rk1/4b1pp/p1pp4/2q1p3/N3PBn1/1R5P/P1PQB1P1/5R1K b - - sm Qa5; c0 "Ivanchuk, Vassily vs Kasparov, Garry 1990.??.??";
Game# 7877, Diff= 1089, Move 20, Score=-1101 - r4rk1/ppp2p1p/5qb1/4n3/3RN3/2P5/PP2QPP1/2K2B1R b - - sm Nc6; c0 "Short, Nigel D. vs Gurevich, Mikhail N. 1990.??.??";
Game# 9978, Diff= 1187, Move 15, Score=-1101 - r1br2k1/1pp1nppp/p1n5/3P4/B1q5/2N2N2/PP2QPPP/R5KR b - - sm Bg4; c0 "Alekhine, Alexander A. vs Bogoljubow, Efim D. 1914.??.??";
Game# 9978, Diff= 1230, Move 16, Score= 129 - r2r2k1/1pp1nppp/p1n5/3P4/B1q3b1/2N2N2/PP2QPPP/R5KR w - - sm Bb3; c0 "Alekhine, Alexander A. vs Bogoljubow, Efim D. 1914.??.??";
Game# 10672, Diff= 1204, Move 17, Score= 718 - 1rbqk2r/R3n1pp/3p1p2/1ppBP3/5P2/2Q5/1PP3PP/1NB2RK1 w k - sm Qh3; c0 "Polgar, Judit vs Shirov, Alexei D. 1997.??.??";
Game# 10672, Diff= 3237, Move 17, Score=-2531 - 1rbqk2r/R3n1pp/3p1p2/1ppBP3/5P2/7Q/1PP3PP/1NB2RK1 b k - sm Be6; c0 "Polgar, Judit vs Shirov, Alexei D. 1997.??.??";
Game# 10672, Diff= 3266, Move 18, Score= 735 - 1r1qk2r/R3n1pp/3pbp2/1ppBP3/5P2/7Q/1PP3PP/1NB2RK1 w k - sm b4; c0 "Polgar, Judit vs Shirov, Alexei D. 1997.??.??";
Game# 10672, Diff= 949, Move 18, Score=-218 - 1r1qk2r/R3n1pp/3pbp2/1ppBP3/1P3P2/7Q/2P3PP/1NB2RK1 b k - sm Bc8; c0 "Polgar, Judit vs Shirov, Alexei D. 1997.??.??";
Game# 10672, Diff= 799, Move 19, Score= 581 - 1rbqk2r/R3n1pp/3p1p2/1ppBP3/1P3P2/7Q/2P3PP/1NB2RK1 w k - sm Be4; c0 "Polgar, Judit vs Shirov, Alexei D. 1997.??.??";
Game# 10672, Diff= 32573, Move 19, Score=-31992 - 1rbqk2r/R3n1pp/3p1p2/1pp1P3/1P2BP2/7Q/2P3PP/1NB2RK1 b k - sm Nd5; c0 "Polgar, Judit vs Shirov, Alexei D. 1997.??.??";
Game# 10672, Diff= 32093, Move 20, Score= 101 - 1rbqk2r/R5pp/3p1p2/1ppnP3/1P2BP2/7Q/2P3PP/1NB2RK1 w k - sm exf6; c0 "Polgar, Judit vs Shirov, Alexei D. 1997.??.??";
Game# 10672, Diff= 32093, Move 20, Score=-31992 - 1rbqk2r/R5pp/3p1P2/1ppn4/1P2BP2/7Q/2P3PP/1NB2RK1 b k - sm Bg4; c0 "Polgar, Judit vs Shirov, Alexei D. 1997.??.??";
Game# 12253, Diff= 1097, Move 19, Score=-1276 - 1r3k1r/p1qb3p/2p2b2/2Pp1pp1/PP1N2nP/2B1PP2/2PNK3/R1Q4R b - - sm Qd6; c0 "Janowski, Dawid M. vs Marshall, Frank J. 1907.??.??";
Game# 12253, Diff= 1030, Move 20, Score=-251 - 1r3k1r/p2b3p/2pq1b2/2Pp1pp1/PP1N2nP/2B1PP2/2PNK3/R1Q4R w - - sm Bb2; c0 "Janowski, Dawid M. vs Marshall, Frank J. 1907.??.??";
Game# 12253, Diff= 1246, Move 20, Score=-1486 - 1r3k1r/p2b3p/2pq1b2/2Pp1pp1/PP1N2nP/4PP2/1BPNK3/R1Q4R b - - sm Be7; c0 "Janowski, Dawid M. vs Marshall, Frank J. 1907.??.??";
Game# 14504, Diff= 810, Move 13, Score=-796 - 2rq1rk1/pb2bppp/1pn1pn2/8/3P1B2/P1N2N2/BP3PPP/2RQ1RK1 b - - sm Qc7; c0 "Schlechter, Carl vs Rubinstein, Akiba K. 1912.??.??";
Game# 14504, Diff= 810, Move 14, Score= 14 - 2r2rk1/pbq1bppp/1pn1pn2/8/3P1B2/P1N2N2/BP3PPP/2RQ1RK1 w - - sm Be3; c0 "Schlechter, Carl vs Rubinstein, Akiba K. 1912.??.??";
Game# 14574, Diff= 1003, Move 19, Score=-1186 - r3rbk1/p4ppp/q4n2/1P1p1bB1/2P1p3/2N1P3/1PQN1PPP/3R1RK1 b - - sm Bb4; c0 "Korchnoi, Viktor L. vs Karpov, Anatoly 1978.??.??";
Game# 14574, Diff= 1101, Move 20, Score=-85 - r3r1k1/p4ppp/q4n2/1P1p1bB1/1bP1p3/2N1P3/1PQN1PPP/3R1RK1 w - - sm Na4; c0 "Korchnoi, Viktor L. vs Karpov, Anatoly 1978.??.??";
Game# 14574, Diff= 1098, Move 20, Score=-1186 - r3r1k1/p4ppp/q4n2/1P1p1bB1/NbP1p3/4P3/1PQN1PPP/3R1RK1 b - - sm Bd6; c0 "Korchnoi, Viktor L. vs Karpov, Anatoly 1978.??.??";
Game# 17228, Diff= 893, Move 20, Score= 801 - r2q1rk1/2p2ppp/3bp3/P7/1p1Pn3/P3P1P1/3Q1PNP/RN1R2K1 w - - sm Ne1; c0 "Vaganian, Rafael A. vs Beliavsky, Alexander G. 1988.??.??";
Game# 17228, Diff= 915, Move 20, Score=-115 - r2q1rk1/2p2ppp/3bp3/P7/1p1Pn3/P3P1P1/3Q1P1P/RN1RN1K1 b - - sm Ng5; c0 "Vaganian, Rafael A. vs Beliavsky, Alexander G. 1988.??.??";
Game# 17468, Diff= 1081, Move 11, Score=-1096 - r1bqk2r/1pp2ppp/3p4/p2nn1B1/1bPN4/2N3P1/PPQ1PPBP/R4RK1 b kq - sm h6; c0 "Polugaevsky, Lev A. vs Smyslov, Vassily V. 1979.??.??";
Game# 17468, Diff= 1397, Move 12, Score= 301 - r1bqk2r/1pp2pp1/3p3p/p2nn1B1/1bPN4/2N3P1/PPQ1PPBP/R4RK1 w kq - sm Bf6; c0 "Polugaevsky, Lev A. vs Smyslov, Vassily V. 1979.??.??";

[Mike S.]

I agree to these considerations. As for my NP-based book, it could be tested if configured as the Arena Mainbook, and limit "Use book up to halfmove" to 16 or 20 and let one engine use it, and give the big book as engine book to the opponent, unlimited. But nevertheless, it is a rather "generic" book not created for top engine peformance. That means, any big book which is carefully edited, engine-tuned and updated, is probably stronger.

One considerable point is IMO, that if one book goes off-theory, the other book will often have no replies stored against it (here or at the next move...) and go out of book soon too, despite being much bigger.